add pablo's conntrack tool

1 files changed, 67 insertions, 0 deletions

diff --git a/extensions/libct_proto_udp.c b/extensions/libct_proto_udp.c
new file mode 100644
index 0000000..8022913
--- /dev/null
+++ b/extensions/libct_proto_udp.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <netinet/in.h> /* For htons */
+#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include "../include/libct_proto.h"
+
+static struct option opts[] = {
+	{"orig-port-src", 1, 0, '1'},
+	{"orig-port-dst", 1, 0, '2'},
+	{"reply-port-src", 1, 0, '3'},
+	{"reply-port-dst", 1, 0, '4'},
+	{0, 0, 0, 0}
+};
+
+int parse(char c, char *argv[], 
+	   struct ip_conntrack_tuple *orig,
+	   struct ip_conntrack_tuple *reply)
+{
+	switch(c) {
+		case '1':
+			if (optarg)
+				orig->src.u.udp.port = htons(atoi(optarg));
+			break;
+		case '2':
+			if (optarg)
+				orig->dst.u.udp.port = htons(atoi(optarg));
+			break;
+		case '3':
+			if (optarg)
+				reply->src.u.udp.port = htons(atoi(optarg));
+			break;
+		case '4':
+			if (optarg)
+				reply->dst.u.udp.port = htons(atoi(optarg));
+			break;
+	}
+	return 1;
+}
+
+void print(struct ip_conntrack_tuple *t)
+{
+	printf("sport=%d dport=%d ", ntohs(t->src.u.udp.port), 
+				     ntohs(t->dst.u.udp.port));
+}
+
+static struct ctproto_handler udp = {
+	.name 		= "udp",
+	.protonum	= 17,
+	.parse		= parse,
+	.print		= print,
+	.opts		= opts
+};
+
+void __attribute__ ((constructor)) init(void);
+void __attribute__ ((destructor)) fini(void);
+
+void init(void)
+{
+	register_proto(&udp);
+}
+
+void fini(void)
+{
+	unregister_proto(&udp);
+}